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<p>The high cost, complex and demanding preparation process, and poor environmental friendliness for solid electrolytes are the key issues that restrict their application and commercialization at present. In this work, an environmentally friendly composite solid electrolyte film is achieved using water-soluble polyoxyethylene ether polymer (Pluronic&#xa0;F127), inexpensive lithium nitrate (LiNO<sub>3</sub>) and lithium aluminate (LiAl<sub>5</sub>O<sub>8</sub>, LAO), and deionized water as solvent under conventional atmospheric conditions. F127 provides the ion transport matrix and good flexibility for the electrolyte film, the ionic conductive LAO nanoflakes provide a larger contact area with the polymer and lithium salts, leading to a high ionic conductivity of 6.38 × 10<sup>–4</sup> S cm<sup>−1</sup>, a wide electrochemical stability window (~ 4.5&#xa0;V) and a high ion migration number (~ 0.64). Additionally, the filled LAO reacts with lithium metal to form a stable interfacial transition layer, greatly inhibiting the dendrite growth and enhancing the interfacial stability. The lithium symmetric cell demonstrates excellent cycling stability at 0.1&#xa0;mA&#xa0;cm<sup>−2</sup> for more than 1200&#xa0;h. The assembled lithium iron phosphate (LiFePO<sub>4</sub>)/lithium solid-state battery can be capable of charge/discharge at 2 C and stably cycling at 0.5 C for more than 200 cycles with a capacity retention rate of 85%, exhibiting good rate and cycling performances. This new approach not only provides a good-performance solid electrolyte, but also establishes a scalable green production technology with low organic solvent emissions and production costs, which will greatly facilitate the practical application of solid-state batteries.</p>

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Lithium aluminate nanoflakes boosting a water-soluble polymer solid electrolyte towards practical application for solid-state lithium battery

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Liang Zhong,
  • Yan-yan Chen,
  • Ke Fang,
  • Lian-li Zou,
  • Shahid Hussain,
  • Maoxiang Jing

摘要

The high cost, complex and demanding preparation process, and poor environmental friendliness for solid electrolytes are the key issues that restrict their application and commercialization at present. In this work, an environmentally friendly composite solid electrolyte film is achieved using water-soluble polyoxyethylene ether polymer (Pluronic F127), inexpensive lithium nitrate (LiNO3) and lithium aluminate (LiAl5O8, LAO), and deionized water as solvent under conventional atmospheric conditions. F127 provides the ion transport matrix and good flexibility for the electrolyte film, the ionic conductive LAO nanoflakes provide a larger contact area with the polymer and lithium salts, leading to a high ionic conductivity of 6.38 × 10–4 S cm−1, a wide electrochemical stability window (~ 4.5 V) and a high ion migration number (~ 0.64). Additionally, the filled LAO reacts with lithium metal to form a stable interfacial transition layer, greatly inhibiting the dendrite growth and enhancing the interfacial stability. The lithium symmetric cell demonstrates excellent cycling stability at 0.1 mA cm−2 for more than 1200 h. The assembled lithium iron phosphate (LiFePO4)/lithium solid-state battery can be capable of charge/discharge at 2 C and stably cycling at 0.5 C for more than 200 cycles with a capacity retention rate of 85%, exhibiting good rate and cycling performances. This new approach not only provides a good-performance solid electrolyte, but also establishes a scalable green production technology with low organic solvent emissions and production costs, which will greatly facilitate the practical application of solid-state batteries.